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Try not, Do or Do not
Join Date: Apr 2004
Location: Fallbrook, Ca. 92028
Posts: 14,261
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Although the spec book states 1.4:1 ratio on the fan, the actual measurement can vary based on the stretch on the belt. The higher the belt rides in the v grove the lower the ratio. The early belts were most often 9.5 x 710 and the new belts are generally 10x710 changing the ratio yet again.
During our research we have found that the early pulleys measure 117 mm crank and 90 mm fan on average.
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